One thing I saw on 4chan was that they were debating on if these two had sex after the episode ended. In the end they agreed that they just made out.

So what do you guys think? I'm pretty sure they didn't have sex but maybe a couple of kisses here and there wouldn't have hurt.

well in the anime they did kiss at the end... (i zoomed the hell outta that pic, they did kiss) and they were looking really happy while falling together, karen said tsukihi would take a while to get back and they could try extra things so yeah...not sex but they crossed most of the other lines